標題: Effect of Rainfall, Runoff and Infiltration Processes on the Stability of Footslopes
作者: Chen, Hung-En
Chiu, Yen-Yu
Tsai, Tung-Lin
Yang, Jinn-Chuang
防災與水環境研究中心
Disaster Prevention and Water Environment Research Center
關鍵字: shallow landslide;rainfall-runoff;numerical model;slope stability
公開日期: 1-May-2020
摘要: To analyze the effect of runoff on shallow landslides, a model coupling one-dimensional rainfall-runoff and two-dimensional infiltration was established to simulate rainfall, infiltration, and runoff processes. Based on Bishop's limit equilibrium method, the slope failure of a hypothetical footslope was studied. First, conditions with and without inflow were compared. The results reveal a remarkable difference in factors of safety (FS) between the two conditions, suggesting that considering the effect of runoff is crucial for landslide modeling. In terms of a series of tests of the various magnitudes, durations, lag-time, and peak position of the hydrograph, analyses show that larger inflow leads to more accumulated infiltration and triggers landslides earlier. A long-term duration inflow decreases the stability more than short intensive inflow does. With subsequent surface inflow, slope failure may occur after rainfalls stop, owing to the inflow, and the shape of inflow hydrographs could slightly affect the variance in FS. Results also indicate the necessity of considering the surface runoff when using a numerical model to analyze landslide, particularly on a footslope.
URI: http://dx.doi.org/10.3390/w12051229
http://hdl.handle.net/11536/155081
DOI: 10.3390/w12051229
期刊: WATER
Volume: 12
Issue: 5
起始頁: 0
結束頁: 0
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